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(2S)-2-[[(2S)-1-[(2S,3As,6aS)-2-[(5-methyl-2-oxo-1,3-dioxolan-4-yl)methoxycarbonyl]-3,3a,4,5,6,6a-hexahydro-2H-cyclopenta[b]pyrrol-1-yl]-1-oxopropan-2-yl]amino]-4-phenylbutanoic acid


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